阻止虫体DNA、RNA合成（）
A．头孢菌素
B．头孢他定
C．头孢拉定
D．头孢吡肟
E．头孢呋辛
参考答案：A
—Excuse me, what's the time, please?
—Sorry. I don't have a (an) with me. [ ]
A.
B.
C.
电力系统中重大事故有哪些？
